On your Fire TV's home screen click SETTINGS
Click 'My Fire TV'
Click 'Developer Options'
Enable 'Apps from Unknown Sources'
Click the HOME button on your remote to return to the home screen.
Click the Search Icon in the top/left corner
Type: DOWNLOADER
Click Downloader Link
Install and Open
Click OK on the message on screen
In the browser window type: http://xstreamstv.com/download
Click GO.
Download, Install and Open
Enter your username and password.